A Marine landing craft can be approximated by a box-shaped, rectangular barge with the following dimensions: Length = 120 feet, Beam = 25 feet, and Depth = 7.5 feet. When empty the barge has a draft of 2.5 feet. You are the Combat Cargo Officer on an amphibious ship responsible for the safe loading of landing craft. a. The landing craft has a maximum safe draft of 5.25 feet. How many tons of cargo can be loaded without exceeding this draft? b. An amphibious operation requires that the landing craft must cross a shoal that is 150 yards from the beach. At high tide the charted depth at the shoal is 4.5 feet. How many tons of cargo can be loaded on the barge so that it will safely arrive at the beach and not run aground? c.The landing craft is loaded to a draft of 5 feet in salt water, and is going to a pier located in a fresh water river. At low tide the depth of water pierside is 5.5 feet. Will the boat ground itself at low tide? Why or why not?
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
A Marine landing craft can be approximated by a box-shaped, rectangular barge with the following dimensions: Length = 120 feet, Beam = 25 feet, and Depth = 7.5 feet. When empty the barge has a draft of 2.5 feet. You are the Combat Cargo Officer on an amphibious ship responsible for the safe loading of landing craft.
a. The landing craft has a maximum safe draft of 5.25 feet. How many tons of cargo can be loaded without exceeding this draft?
b. An amphibious operation requires that the landing craft must cross a shoal that is 150 yards from the beach. At high tide the charted depth at the shoal is 4.5 feet. How many tons of cargo can be loaded on the barge so that it will safely arrive at the beach and not run aground?
c.The landing craft is loaded to a draft of 5 feet in salt water, and is going to a pier located in a fresh water river. At low tide the depth of water pierside is 5.5 feet. Will the boat ground itself at low tide? Why or why not?
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